QC check

models/database/base.py

@@ -1,9 +1,13 @@
 from datetime import datetime
+
 from sqlalchemy import Column, DateTime
+
 from app.core.database import Base
 
+
 class TimestampMixin:
     """Mixin to add created_at and updated_at timestamps to models"""
+
     created_at = Column(DateTime, default=datetime.utcnow, nullable=False)
     updated_at = Column(
         DateTime, default=datetime.utcnow, onupdate=datetime.utcnow, nullable=False